Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
The genus Dysdercus Guerin Meneville 1831 represents the only taxon within the family Pyrrhocoridae in the New World. Based on morphological features, it has been suggested that American species derived from immigrants from the Old World, most probably from the Ethiopian Region. So far, 10 species f...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09673849_v7_n7_p503_Bressa http://hdl.handle.net/20.500.12110/paper_09673849_v7_n7_p503_Bressa |
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paper:paper_09673849_v7_n7_p503_Bressa2023-06-08T15:58:48Z Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera Bressa, Maria Jose Papeschi, Alba Graciela Mola, Liliana Maria Dysdercus albofasciatus Heteroptera Holokinetic chromosomes Neo-XY Pyrrhocoridae amino acid sequence animal cell article autosome chromosome analysis chromosome number diploidy Heteroptera insect meiosis metaphase nonhuman priority journal sex chromosome X chromosome Animals Heteroptera Karyotyping Male Meiosis X Chromosome Y Chromosome Animalia Arachnida Dysdercus Heteroptera Hexapoda Insecta Pyrrhocoridae The genus Dysdercus Guerin Meneville 1831 represents the only taxon within the family Pyrrhocoridae in the New World. Based on morphological features, it has been suggested that American species derived from immigrants from the Old World, most probably from the Ethiopian Region. So far, 10 species from Dysdercus, including six species from the Old World and four species from the Neotropical Region have been cytogenetically analyzed. As is characteristic of Heteroptera, they possess holokinetic chromosomes and a prereductional type of meiosis. While the X1X2O sex chromosome system has been reported in all cytologically analyzed species of Dysdercus from the Old World, the system X0 has been found in all but one species from the New World, regardless of the number of autosomes in the complement. In the present study the male meiosis of D. albofasciatus Berg 1878 was studied in specimens from four different populations from Argentina. The diploid chromosome number was found to be 2n = 10 + neo-XY. The neo-X shows at each subterminal region a positively heteropycnotic and DAPI-bright segment which corresponds to the ancestral X-chromosome. The origin of this neo-XY system involved, most probably, a subterminal insertion of the ancestral X chromosome in an autosome, followed by a large inversion, which included part of the original X chromosome. Fil:Bressa, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Papeschi, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mola, L.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09673849_v7_n7_p503_Bressa http://hdl.handle.net/20.500.12110/paper_09673849_v7_n7_p503_Bressa |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Dysdercus albofasciatus Heteroptera Holokinetic chromosomes Neo-XY Pyrrhocoridae amino acid sequence animal cell article autosome chromosome analysis chromosome number diploidy Heteroptera insect meiosis metaphase nonhuman priority journal sex chromosome X chromosome Animals Heteroptera Karyotyping Male Meiosis X Chromosome Y Chromosome Animalia Arachnida Dysdercus Heteroptera Hexapoda Insecta Pyrrhocoridae |
| spellingShingle |
Dysdercus albofasciatus Heteroptera Holokinetic chromosomes Neo-XY Pyrrhocoridae amino acid sequence animal cell article autosome chromosome analysis chromosome number diploidy Heteroptera insect meiosis metaphase nonhuman priority journal sex chromosome X chromosome Animals Heteroptera Karyotyping Male Meiosis X Chromosome Y Chromosome Animalia Arachnida Dysdercus Heteroptera Hexapoda Insecta Pyrrhocoridae Bressa, Maria Jose Papeschi, Alba Graciela Mola, Liliana Maria Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera |
| topic_facet |
Dysdercus albofasciatus Heteroptera Holokinetic chromosomes Neo-XY Pyrrhocoridae amino acid sequence animal cell article autosome chromosome analysis chromosome number diploidy Heteroptera insect meiosis metaphase nonhuman priority journal sex chromosome X chromosome Animals Heteroptera Karyotyping Male Meiosis X Chromosome Y Chromosome Animalia Arachnida Dysdercus Heteroptera Hexapoda Insecta Pyrrhocoridae |
| description |
The genus Dysdercus Guerin Meneville 1831 represents the only taxon within the family Pyrrhocoridae in the New World. Based on morphological features, it has been suggested that American species derived from immigrants from the Old World, most probably from the Ethiopian Region. So far, 10 species from Dysdercus, including six species from the Old World and four species from the Neotropical Region have been cytogenetically analyzed. As is characteristic of Heteroptera, they possess holokinetic chromosomes and a prereductional type of meiosis. While the X1X2O sex chromosome system has been reported in all cytologically analyzed species of Dysdercus from the Old World, the system X0 has been found in all but one species from the New World, regardless of the number of autosomes in the complement. In the present study the male meiosis of D. albofasciatus Berg 1878 was studied in specimens from four different populations from Argentina. The diploid chromosome number was found to be 2n = 10 + neo-XY. The neo-X shows at each subterminal region a positively heteropycnotic and DAPI-bright segment which corresponds to the ancestral X-chromosome. The origin of this neo-XY system involved, most probably, a subterminal insertion of the ancestral X chromosome in an autosome, followed by a large inversion, which included part of the original X chromosome. |
| author |
Bressa, Maria Jose Papeschi, Alba Graciela Mola, Liliana Maria |
| author_facet |
Bressa, Maria Jose Papeschi, Alba Graciela Mola, Liliana Maria |
| author_sort |
Bressa, Maria Jose |
| title |
Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera |
| title_short |
Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera |
| title_full |
Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera |
| title_fullStr |
Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera |
| title_full_unstemmed |
Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera |
| title_sort |
meiotic studies in dysdercus guerin meneville 1831 (heteroptera: pyrrhocoridae). i. neo-xy in dysdercus albofasciatus berg 1878, a new sex chromosome determining system in heteroptera |
| publishDate |
1999 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09673849_v7_n7_p503_Bressa http://hdl.handle.net/20.500.12110/paper_09673849_v7_n7_p503_Bressa |
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